package com.learn.yzh.util;

/**
 * @program: yzh->HttpClientUtil
 * @description: HttpClient工具类
 * @author: yangzhanghui
 * @create: 2019-09-08 14:38
 **/
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class HttpClientUtil {

    private static final Logger log = LoggerFactory.getLogger(HttpClientUtil.class);

    public static String UTF8 = "UTF-8";

    public static String httpPost(String url, Map<String, String> params, String encoding) throws Exception {
        log.debug("收到HTTP POST请求");
        String result = "";
        // 创建默认的httpClient实例.
        CloseableHttpClient httpclient = HttpClients.createDefault();
        // 创建httppost
        HttpPost httppost = new HttpPost(url);
        //参数
        List<NameValuePair> formparams = new ArrayList<NameValuePair>();
        if (params != null) {
            log.debug("发送post参数");
            Set<String> keys = params.keySet();
            for (String key : keys) {
                log.debug("param:" + key);
                formparams.add(new BasicNameValuePair(key, params.get(key)));
            }
        }
        UrlEncodedFormEntity uefEntity;
        try {
            uefEntity = new UrlEncodedFormEntity(formparams, encoding);
            httppost.setEntity(uefEntity);
            log.debug("executing request " + httppost.getURI());
            CloseableHttpResponse response = httpclient.execute(httppost);
            try {
                log.debug("返回HTTP状态:" + response.getStatusLine());
                Header[] headers = response.getAllHeaders();
                log.debug("返回HTTP头");
                log.debug("--------------------------------------");
                for (Header header : headers) {
                    log.debug(header.getName() + "-->" + header.getValue());
                }
                log.debug("--------------------------------------");
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    result = EntityUtils.toString(entity, encoding);
                    log.debug("--------------------------------------");
                    log.debug("Response content: " + result);
                    log.debug("--------------------------------------");
                }
            } finally {
                response.close();
            }
        } catch (IOException e) {
            throw e;
        } finally {
        // 关闭连接,释放资源
            try {
                httpclient.close();
            } catch (IOException e) {
            }
        }
        return result;
    }

    public static String httpGet(String url, String encoding) throws Exception {
        log.debug("收到HTTP GET请求");
        String result = "";
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            // 创建httpget.
            HttpGet httpget = new HttpGet(url);
            log.debug("executing request " + httpget.getURI());
            // 执行get请求.
            CloseableHttpResponse response = httpclient.execute(httpget);
            try {
                log.debug("返回HTTP状态:" + response.getStatusLine());
                Header[] headers = response.getAllHeaders();
                log.debug("返回HTTP头");
                log.debug("--------------------------------------");
                for (Header header : headers) {
                    log.debug(header.getName() + "-->" + header.getValue());
                }
                log.debug("--------------------------------------"); // 获取响应实体
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    result = EntityUtils.toString(entity, encoding);
                    // 打印响应内容
                    log.debug("Response content: " + result);
                }
                log.debug("------------------------------------");
            } finally {
                response.close();
            }
        } catch (Exception e) {
            throw e;
        } finally {
// 关闭连接,释放资源
            try {
                httpclient.close();
            } catch (IOException e) {
            }
        }
        return result;
    }
}